Organic matter decomposition treatment device

Abstract

To reduce a generation of industrial waste and enable low-cost processing of an organic matter.SOLUTION: A decomposition treatment device 10 is a device for decomposing an organic matter in a liquid to be treated, and comprises a decomposition treatment tank 11 capable of performing decomposition treatment using ozone to the liquid to be treated, an ozone supply device 12 capable of supplying ozone to the decomposition treatment tank 11, a filtration device 13 capable of performing filtration treatment to the liquid to be treated, and a circulation device 14 capable of circulating the liquid to be treated between the decomposition treatment tank 11 and the filtration device 13.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a decomposition treatment device for organic matter, and more particularly to a technique for decomposing organic matter contained in a liquid. [Background technology]

[0002] In recent years, the use of water-based paints has been increasing in the automotive painting process, taking environmental impact into consideration. However, the waste water-based paint generated during color changes, etc., is difficult to recycle and must be treated as industrial waste. Because the cost required for this treatment is high, it is necessary to separate and remove the organic matter that becomes paint from the waste water in order to reduce running costs.

[0003] Known means for removing organic matter, which is the main component of paint, from this type of waste liquid include a method of separating and removing the organic matter by flocculating and precipitating the organic matter using a flocculant (see, for example, Patent Document 1), and a method of decomposing the organic matter by adding an oxidizing agent to perform a specified oxidation treatment (see, for example, Patent Document 2).

[0004] Furthermore, as a method for removing organic matter without using chemicals such as those mentioned above, a method has been proposed in which ozone gas is supplied to the liquid to be treated, causing it to react with the ozone, thereby subjecting the organic matter to an oxidation-promoting treatment, thereby decomposing the organic matter (see Patent Document 3). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-50887 [Patent Document 2] Japanese Patent Application Laid-Open No. 2004-89854 [Patent Document 3] Japanese Patent Publication No. 2020-189256 Summary of the Invention [Problem to be solved by the invention]

[0006] The method of removing organic matter using coagulants or oxidizing agents has a drawback in that it requires high chemical costs. In addition, the organic matter aggregates and oxides remain as large amounts of industrial waste, which makes it unsuitable for reducing running costs. Of course, it is also not a desirable method from the viewpoint of ensuring worker safety.

[0007] In view of the above circumstances, the technical problem to be solved in this specification is to provide a technology that enables organic matter to be treated at low cost while suppressing the generation of industrial waste. [Means for solving the problem]

[0008] The above-mentioned problems are solved by the decomposition treatment device for organic matter according to the present invention. That is, this decomposition treatment device is an apparatus for decomposing organic matter in a liquid to be treated, and is characterized by comprising a decomposition treatment tank capable of decomposing the liquid to be treated with ozone, an ozone supplying device capable of supplying ozone to the decomposition treatment tank, a filtration device capable of filtering the liquid to be treated, and a circulating device capable of circulating the liquid to be treated between the decomposition treatment tank and the filtration device.

[0009] The present inventors focused on ozone treatment, a type of oxidation-promoting treatment, and investigated the use of ozone treatment to decompose organic matter. They found that, depending on the organic matter, a considerable amount of solid organic matter is generated as a result of ozone decomposition. Furthermore, because ozone decomposes not only organic matter in the treated liquid but also solid organic matter, this solid organic matter may hinder the rapid decomposition of the organic matter contained in the treated liquid before decomposition. (In other words, if solid organic matter remains in the treated liquid, it takes a long time to reduce the concentration of organic matter in the treated liquid to a level that is considered substantially harmless.) In light of these findings, the present invention provides a decomposition treatment tank capable of decomposing the treated liquid using ozone, a filtration device capable of filtering the treated liquid, and a circulation device capable of circulating the treated liquid between the decomposition treatment tank and the filtration device. This configuration allows for continuous decomposition of organic matter using ozone in the decomposition treatment tank and filtration of the decomposed treated liquid. In addition, solid organic matter produced as a result of the decomposition treatment using ozone is removed from the liquid being treated by a filtration device. As a result, in the decomposition treatment tank, the decomposition treatment using ozone can be continuously performed mainly on the organic matter in the liquid being treated before the decomposition treatment, so that the decomposition treatment using ozone can be performed efficiently for the organic matter in the liquid being treated as a whole, and the decomposition treatment can be completed in a short period of time. As described above, according to the present invention, it is possible to significantly reduce the cost associated with the disposal of the liquid being treated by processing it in a short period of time.

[0010] In the decomposition treatment device according to the present invention, the filtration device may include a centrifugal filtration device connected to the decomposition treatment tank.

[0011] For example, the liquid to be treated, such as wastewater generated in a factory, often contains not only organic matter to be decomposed, but also solid matter such as tiny metal fragments and resin processing waste. By providing a centrifugal filter as the filtration device, solid matter (including solid organic matter) with a higher specific gravity than the medium (usually water) in the liquid to be treated can be removed from the liquid to be treated. This effectively removes these types of solid matter, further increasing the efficiency of decomposition of the organic matter in the liquid to be treated.

[0012] In the decomposition treatment device according to the present invention, the filtering device may further include a bag filter connected to the decomposition treatment tank.

[0013] In this way, by providing a bag filter connected to the decomposition treatment tank as a filtration device, it is possible to remove solids, such as solid organic matter, that have a lower specific gravity than the medium of the liquid being treated from the liquid being treated. Furthermore, a bag filter can capture all solids, even those of a collectable size, and its bag-like shape allows it to effectively remove the above-mentioned types of solids. Therefore, it is possible to perform filtration without leakage on the liquid being treated during circulation.

[0014] In the decomposition treatment apparatus according to the present invention, the ozone supply device may have a gas supply pipe capable of supplying a gas containing ozone to the decomposition treatment tank, and the gas supply pipe may open to a lower portion of the decomposition treatment tank.

[0015] By setting the opening position of the gas supply pipe in this way, the ozone gas supplied to the decomposition treatment tank can react with the liquid to be treated for as long as possible, thereby enabling more effective decomposition of organic matter using ozone.

[0016] Furthermore, in the decomposition treatment device according to the present invention, the circulation device has a first flow pipe through which the liquid to be treated can flow from the decomposition treatment tank toward the filtration device, and a second flow pipe through which the liquid to be treated can flow from the filtration device toward the decomposition treatment tank, and the first flow pipe may open to the bottom of the decomposition treatment tank, and the second flow pipe may open to the top of the decomposition treatment tank.

[0017] By configuring the circulation device in this manner, the liquid to be treated can be sent to the filtration device from the bottom of the decomposition treatment tank, where solids are likely to settle. Furthermore, by sending the liquid to be treated that has been treated in the filtration device as close to the top of the decomposition treatment tank as possible, the precipitation of solids can be maximized. Furthermore, by increasing the distance from the outlet (opening of the first flow pipe) for the liquid to be treated in the decomposition treatment tank to the inlet (opening of the second flow pipe) for the circulating liquid to be treated, the time during which the circulating liquid to be treated is exposed to ozone gas can be maximized. Therefore, with the above configuration, it is possible to more effectively perform the decomposition treatment of organic matter and the removal of solids.

[0018] In the decomposition treatment device according to the present invention, the liquid to be treated may be an aqueous solution of organic matter. In this case, the decomposition treatment device may include a water quality measuring device capable of measuring values ​​related to the water quality of the liquid to be treated inside the decomposition treatment tank, and a control unit capable of controlling the introduction of the liquid to be treated into the decomposition treatment tank and the discharge of the liquid to be treated from the decomposition treatment tank, and the control unit may start the discharge of the liquid to be treated from the decomposition treatment tank based on the values ​​measured by the water quality measuring device, and may start the introduction of the liquid to be treated into the decomposition treatment tank after the discharge is completed.

[0019] When the liquid to be treated is an aqueous solution of organic matter, the decomposition treatment device of the present invention can efficiently decompose the organic matter while gradually reducing the concentration of organic matter in the liquid to be treated in the decomposition treatment tank. Therefore, as described above, when the water quality of the liquid to be treated measured by the water quality measuring device has improved to a predetermined level, the liquid to be treated in the decomposition treatment tank is completely discharged, and the introduction of the pre-decomposition liquid begins at the timing when the discharge is completed, thereby performing the decomposition treatment on the liquid to be treated as a batch process. Therefore, with the above configuration, it is possible to efficiently treat a large amount of liquid to be treated in a short period of time. [Effects of the Invention]

[0020] As described above, the decomposition treatment device for organic matter according to the present invention makes it possible to suppress the generation of industrial waste and to carry out the decomposition treatment of organic matter at low cost. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a diagram showing the overall configuration of an organic matter decomposition treatment device according to one embodiment of the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0022] Hereinafter, the details of an organic matter decomposition treatment device according to one embodiment of the present invention will be described with reference to the drawings.

[0023] 1 shows the overall configuration of a decomposition treatment device 10 according to one embodiment of the present invention. This decomposition treatment device 10 is an apparatus for decomposing organic matter in paint waste liquid, such as aqueous paint waste liquid generated in an automobile paint booth, and mainly comprises a decomposition treatment tank 11 capable of decomposing the paint waste liquid using ozone, an ozone supply device 12 capable of supplying ozone to the decomposition treatment tank 11, a filtration device 13 capable of filtering the paint waste liquid, and a circulator 14 capable of circulating the paint waste liquid between the decomposition treatment tank 11 and the filtration device 13.

[0024] In this embodiment, the decomposition treatment device 10 further includes a receiving tank 15 that receives the paint waste liquid, and a secondary treatment tank 16 that performs secondary treatment on the paint waste liquid that has been decomposed in the decomposition treatment tank 11. Each element will be described in detail below.

[0025] The decomposition treatment tank 11 is configured to be capable of storing the paint waste liquid to be treated. Also, the ozone supplied to the paint waste liquid in the decomposition treatment tank 11 by the ozone supply device 12 is capable of decomposing organic matter in the paint waste liquid in the decomposition treatment tank 11. An agitator may be provided in the decomposition treatment tank 11 to increase the frequency of reaction between the ozone (ozone gas G) and the paint waste liquid.

[0026] The ozone supply device 12 has an ozone generator 12a that generates ozone, and a gas supply pipe 12b for supplying the ozone generated by the ozone generator 12a into the decomposition treatment tank 11 in the form of ozone gas G of a predetermined concentration. In this case, the gas supply pipe 12b opens at the bottom of the decomposition treatment tank 11, and the ozone gas G supplied to the paint waste liquid in the decomposition treatment tank 11 through the gas supply pipe 12b reacts with the paint waste liquid in the decomposition treatment tank 11 while floating up in the decomposition treatment tank 11.

[0027] The ozone generator 12a may be a device capable of generating ozone by known means such as a discharge method or an ultraviolet lamp method. As for the raw material gas for the ozone gas G, known gases such as air and oxygen may be used.

[0028] The filtration device 13 is connected to the decomposition treatment tank 11 and is configured to be able to perform a predetermined filtration process on the paint waste liquid in the decomposition treatment tank 11. In this embodiment, the filtration device 13 has a centrifugal filter device 17 and a bag filter 18.

[0029] The centrifugal filter device 17 can have any configuration as long as it can separate the solid matter in the paint waste liquid from the medium, and when considering use in combination with a bag filter 18, for example, it is desirable that it be configured to be able to capture (filter) substances (solid matter) with a higher specific gravity than the medium (water in this case) of the paint waste liquid. Furthermore, when considering performing filtration while circulating the paint waste liquid between the decomposition treatment tank 11, it is desirable that it be configured so that the above filtration can be performed continuously.

[0030] The bag filter 18 can have any configuration as long as it can separate the solid matter in the paint waste liquid from the medium. For example, when considering use in combination with the centrifugal filter device 17, it is desirable that it be configured to be able to filter substances with a smaller specific gravity than the medium of the paint waste liquid.

[0031] The circulation device 14 has a first circulation pipe 19a through which the paint waste liquid can flow from the decomposition treatment tank 11 toward the filtration device 13, and a second circulation pipe 19b through which the paint waste liquid can flow from the filtration device 13 toward the decomposition treatment tank 11. In this embodiment, the first circulation pipe 19a connects the decomposition treatment tank 11 and the centrifugal filter device 17, and the second circulation pipe 19b connects the bag filter 18 and the decomposition treatment tank 11. The centrifugal filter device 17 and the bag filter 18 are also connected via a third circulation pipe 19c. One or more pumps 20 are provided in these circulation pipes 19a-19c, and the pumps 20 enable the paint waste liquid to be pressure-fed in a predetermined direction. In this embodiment, the pump 20 is provided in the first circulation pipe 19a, which allows the paint waste liquid to circulate from the decomposition treatment tank 11 to the centrifugal filter device 17, from the centrifugal filter device 17 to the bag filter 18, and from the bag filter 18 to the decomposition treatment tank 11.

[0032] In principle, the connection position (opening position) between the first flow pipe 19a and the decomposition treatment tank 11 is arbitrary, but in consideration of supplying as much solid matter as possible from the decomposition treatment tank 11 together with the paint waste liquid to the filtration device 13, it is preferable to connect (open) the first flow pipe 19a to the bottom of the decomposition treatment tank 11. The connection position (opening position) between the second flow pipe 19b and the decomposition treatment tank 11 is also arbitrary, but in consideration of reacting the paint waste liquid returned to the decomposition treatment tank 11 with the ozone gas G for as long as possible, it is preferable to connect (open) the second flow pipe 19b to a position as far as possible from the bottom of the decomposition treatment tank 11, i.e., to the top of the decomposition treatment tank 11.

[0033] In addition, in this embodiment, the decomposition treatment device 10 further includes a water quality measuring instrument 21 capable of measuring values ​​related to the water quality of the paint waste liquid inside the decomposition treatment tank 11, a pump 22 that discharges the paint waste liquid from the decomposition treatment tank 11, a water quality measuring instrument 23 that can measure values ​​related to the water quality of the paint waste liquid inside the secondary treatment tank 16, a pump 24 that discharges the paint waste liquid from the secondary treatment tank 16, a pump 25 that discharges the paint waste liquid from the receiving tank 15 and sends (introduces) it into the decomposition treatment tank 11, and a control unit 26 that can control the operation of each pump 22, 24, 25 based on the measurement values ​​of these water quality measuring instruments 21, 23.

[0034] Examples of values ​​related to water quality that can be measured by the water quality measuring instruments 21 and 23 include chemical oxygen demand (COD) and biochemical oxygen demand (BOD). Of course, these are merely examples, and other items necessary for evaluation may also be measured as values ​​related to water quality.

[0035] In this case, the control unit 26 is capable of controlling the operation of the pumps 22, 24, and 25 based on the measurement values ​​of the water quality measuring instruments 21 and 23 so that the batch processing is performed appropriately in the tanks 11, 15, and 16. Details will be described later.

[0036] In this embodiment, a solid collection cart 27 is disposed below the receiving tank 15, the secondary treatment tank 16, and the centrifugal filter 17. Valves (not shown) are provided at the bottom of the receiving tank 15, the secondary treatment tank 16, and the centrifugal filter 17. Opening these valves causes solids that have settled at the bottom of the receiving tank 15 and the secondary treatment tank 16, as well as solids remaining inside the centrifugal filter 17 after filtration, to fall downward and be collected by the collection cart. The medium (liquid) collected with the collection cart 27 when it collects solids that have fallen from the receiving tank 15 is returned to the receiving tank 15 by a pump 28. Similarly, the medium (liquid) collected with the collection cart 27 when it collects solids that have fallen from the secondary treatment tank 16 and the centrifugal filter 17 is returned to the decomposition treatment tank 11 by the pump 28.

[0037] In this embodiment, in consideration of preventing soil contamination and other environmental conservation, a side gutter 29 and a liquid containment dike 30 are provided so as to surround the areas where the tanks 11, 15, and 16 are installed.

[0038] Next, an example of the operation of the decomposition processing device 10 having the above configuration will be described.

[0039] First, upon receiving that a predetermined amount of painting waste liquid has been supplied to the receiving tank 15, the control unit 26 operates the pump 25 to discharge the painting waste liquid inside the receiving tank 15 and send it toward the decomposition treatment tank 11. After a predetermined amount of painting waste liquid has been sent to and stored in the decomposition treatment tank 11, ozone is generated by the ozone generator 12a and ozone gas G is sent to the decomposition treatment tank 11 through the gas supply pipe 12b. In this way, organic matter in the painting waste liquid inside the decomposition treatment tank 11 is decomposed by the ozone. In parallel with this decomposition treatment, the painting waste liquid is filtered by the filtration device 13. Specifically, the pump 20 provided on the first flow pipe 19a is driven to supply the painting waste liquid undergoing decomposition treatment inside the decomposition treatment tank 11 to the centrifugal filter device 17, and also supply the painting waste liquid that has been centrifuged in the centrifugal filter device 17 to the bag filter 18, and circulate the painting waste liquid so that the painting waste liquid that has been filtered in the bag filter 18 is returned to the decomposition treatment tank 11.

[0040] As a result, the decomposition process of organic matter by ozone proceeds while solid matter such as metal pieces contained in the painting waste liquid in the decomposition treatment tank 11 is removed by the filtration device 13 (centrifugal filtration device 17, bag filter 18). Furthermore, when the organic matter in the painting waste liquid is decomposed by the ozone treatment carried out in the decomposition treatment tank 11, solid organic matter may be generated, but this solid organic matter is captured and separated by the filtration device 13 (centrifugal filtration device 17, bag filter 18). Therefore, by continuously carrying out the decomposition process and filtration process as described above while circulating the painting waste liquid, the concentration of organic matter in the painting waste liquid in the decomposition treatment tank 11 is rapidly reduced.

[0041] During the decomposition treatment, the water quality measuring instrument 21 measures the value relating to the water quality of the painting waste liquid in the decomposition treatment tank 11, and when the measured value falls below the first reference value, the control unit 26 operates the pump 22 to send the painting waste liquid in the decomposition treatment tank 11 to the downstream secondary treatment tank 16. In the secondary treatment tank 16, the painting waste liquid is subjected to secondary treatment (for example, sedimentation treatment), and separation of solid organic matter from the painting waste liquid (medium) progresses.

[0042] During the separation process, the water quality measuring instrument 23 measures the water quality of the painting waste liquid in the secondary treatment tank 16, and if the measured value falls below the second standard value, the control unit 26 operates the pump 24 to send the painting waste liquid in the secondary treatment tank 16 further downstream toward the waste liquid treatment plant. Note that the second standard value here is set to a stricter value (lower value) than the first standard value, which is the discharge standard for the painting waste liquid in the decomposition treatment tank 11.

[0043] Furthermore, when all of the painting waste liquid in the secondary treatment tank 16 has been discharged and the numerical value relating to the water quality of the painting waste liquid in the decomposition treatment tank 11 has fallen to a predetermined level or less, the control unit 26 operates the pump 22 for discharging the decomposition treatment tank 11, and sends the painting waste liquid in the decomposition treatment tank 11 toward the secondary treatment tank 16. Then, when all of the painting waste liquid in the decomposition treatment tank 11 has been discharged, the control unit 26 operates the pump 25 for discharging the receiving tank 15, and sends the painting waste liquid in the receiving tank 15 toward the decomposition treatment tank 11. In this way, the decomposition treatment of organic matter in the decomposition treatment tank 11 and the separation treatment in the secondary treatment tank 16 are each carried out sequentially as batch processes.

[0044] As described above, the decomposition treatment device 10 for organic matter according to this embodiment includes a circulation device 14 that circulates the painting waste liquid to be treated between the decomposition treatment tank 11, which can perform ozone decomposition treatment, and the filtration device 13, which can perform filtration treatment. This allows for continuous decomposition treatment of organic matter using ozone in the decomposition treatment tank 11 and filtration of the decomposed painting waste liquid. Furthermore, solid organic matter resulting from the ozone decomposition treatment is removed from the painting waste liquid by the filtration device 13. This allows the decomposition treatment tank 11 to continuously perform ozone decomposition treatment solely on the organic matter in the painting waste liquid before decomposition treatment, thereby enabling efficient ozone decomposition treatment of the entire painting waste liquid and enabling the decomposition treatment to be completed in a short time. As described above, the decomposition treatment device 10 according to this embodiment significantly reduces the cost of disposing of painting waste liquid by processing it in a short time.

[0045] In this embodiment, the filtration device 13 is provided with a centrifugal filtration device 17 and a bag filter 18 connected to the decomposition treatment tank 11. With this configuration, the centrifugal filtration device 17 can remove solids (including solid organic matter) with a higher specific gravity than the medium (here, water) in the painting waste liquid circulating between the decomposition treatment tank 11 and the centrifugal filtration device 17. The bag filter 18 can effectively remove solids with a lower specific gravity (or smaller size) than the medium in the painting waste liquid from the painting waste liquid. In this case, by configuring the filtration device 13 including the centrifugal filtration device 17 to be capable of performing continuous filtration, solids can be removed effectively and without leakage from the circulating painting waste liquid, thereby further improving the decomposition efficiency of organic matter in the painting waste liquid. When the filtration device 13 includes a centrifugal filtration device 17 and a bag filter 18 as in this embodiment, for example, although not shown, it is possible to arrange a plurality of bag filters 18 in parallel with the centrifugal filtration device 17 and connect any one of the bag filters 18 to the centrifugal filtration device 17 in a selectable and switchable manner. With this configuration, at least one bag filter 18 can always be used even during filter replacement, so that continuous filtration is possible even when the filtration device 13 includes a bag filter 18.

[0046] Furthermore, in this embodiment, a control unit 26 is provided that can control the operation of introducing the liquid to be treated into the decomposition treatment tank and the operation of discharging the liquid to be treated from the decomposition treatment tank, and the control unit 26 starts the operation of discharging the painting waste liquid from the decomposition treatment tank 11 when the value measured by the water quality measuring instrument 21 falls below a predetermined value (first reference value), and after the discharge operation is completed, starts the operation of introducing the painting waste liquid into the decomposition treatment tank 11. Therefore, when the water quality of the painting waste liquid in the decomposition treatment tank 11 improves to a predetermined level, all of the painting waste liquid in the decomposition treatment tank 11 can be discharged, and the introduction of the painting waste liquid before decomposition treatment can be started at the timing when the discharge is completed. This allows the painting waste liquid to be subjected to decomposition treatment as a batch process, making it possible to treat large amounts of painting waste liquid efficiently in a short time.

[0047] Although one embodiment of the present invention has been described above, the decomposition treatment device for organic matter according to the present invention can also have other configurations than those described above without departing from the spirit of the invention.

[0048] For example, in the above embodiment, a secondary treatment tank 16 is provided downstream of the decomposition treatment tank 11, and the painting waste liquid decomposed in the decomposition treatment tank 11 is introduced into the secondary treatment tank 16 to undergo secondary treatment such as sedimentation separation for further improvement of water quality. However, the present invention is not limited to this. For example, if the organic matter in the painting waste liquid can be sufficiently decomposed in the decomposition treatment tank 11 and the solid matter in the painting waste liquid can be sufficiently removed by a filtration device 13 or the like, the secondary treatment tank 16 may be omitted and the painting waste liquid in the decomposition treatment tank 11 may be sent directly to a waste liquid treatment plant. Similarly, if the organic matter in the painting waste liquid can be sufficiently decomposed in the decomposition treatment tank 11 and the solid matter in the painting waste liquid can be sufficiently removed by a filtration device 13, the receiving tank 15 may be omitted and the painting waste liquid generated in a painting booth may be sent directly to the decomposition treatment tank 11.

[0049] In the above embodiment, the filter 13 is provided with the centrifugal filter 17 and the bag filter 18, but the present invention is not limited to this. Any type of filter structure can be applied to the filter 13 as long as it can separate and remove solid organic matter generated by the decomposition treatment of organic matter using ozone.

[0050] In addition, the amount of paint waste liquid stored in the decomposition treatment tank 11 or the secondary treatment tank 16 may be measured by directly measuring the liquid level in the decomposition treatment tank 11 or the secondary treatment tank 16, and the control unit 26 may control the operation of each pump 22, 24, 25 based on this measurement value.However, if the capacity of each pump 22, 24, 25 is predetermined, for example, the amount of paint waste liquid stored in each tank 11, 15, 16 may be estimated from the operation time of each pump 22, 24, 25, and the operation of each pump 22, 24, 25 may be controlled based on this estimated amount.

[0051] In the above explanation, a case where a paint waste liquid such as a water-based paint waste liquid is the target of decomposition treatment (liquid to be treated) by the decomposition treatment device 10 has been exemplified, but of course the present invention can also treat liquids other than paint waste liquid. In other words, the present invention can be applied to any type of liquid as long as the liquid contains organic matter that needs to be decomposed. [Explanation of symbols]

[0052] 10 Decomposition treatment equipment 11 Decomposition treatment tank 12 Ozone supply device 12a Ozone generator 12b Gas supply pipe 13 Filtration equipment 14 Circulation device 15 Receiving tank 16 Secondary treatment tank 17 Centrifugal filter 18 Bag filter 19a First flow pipe 19b Second flow pipe 19c Third flow pipe 21,23 Water quality measuring instruments 20, 22, 24, 25, 28 pumps 26 Control Unit 27 Collection trolley 29 Gutter 30 Liquid proof chamber G. Ozone gas

Claims

1. An apparatus for decomposing organic matter in a liquid to be treated, a decomposition treatment tank capable of performing decomposition treatment using ozone on the liquid to be treated; an ozone supply device capable of supplying the ozone to the decomposition treatment tank; a filtration device capable of filtering the liquid to be treated; a circulation device that can circulate the liquid to be treated between the decomposition treatment tank and the filtration device;

2. The organic matter decomposition treatment device according to claim 1 , wherein the filtering device comprises a centrifugal filtering device connected to the decomposition treatment tank.

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